Hi can anyone help please. I decided to change an outside light and when tripping the power off my alarm went off , so I’m assuming the battery in the mains needs replacing, I have had to shut it completely down, disconnected battery, pulled fuse out and had to take red wire for battery in alarm box out, so know it is completely deactivated, my question is when I first activated alarm by tripping fuse it would not accept my code at all hence the reason for me shutting it down completely so when I replace the battery and connect it all back up will it then accept my code or do I need an default code any help would be great...